CRD4412A

CRD4412A Datasheet

CRD4412A

Part	Datasheet
CRD4412A	CRD4412A (pdf)

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CRD4412A 2 x 15 W CS4412A Digital Power Stage Reference Design Pre-Configured for Stereo Full-Bridge Operation Delivers 15 W/Ch into 8 Ω at THD+N Easily Configurable for Mono Parallel FullBridge Operation Delivers 30 W into 4 Ω at <10% THD+N Directly Connects to CRD4525 Digital Amplifier Reference Design Implements a Configuration Flexible I/O Provided PWM Logic Level Signal Inputs CS4412A Error and Warning Signals Operates from +8 V to +18 V and V Demonstrates Recommended Layout and Grounding Arrangements Implements Recommended PWM Output Filtering The CRD4412A demonstrates the CS4412A digital amplifier power stage. This reference design is preconfigured as a two-channel full-bridge power stage which delivers 15 W per channel into 8 Ω loads using a single +18 V supply. The design can be easily configured to operate as a single channel parallel full-bridge power stage capable of delivering 30 W into a 4 Ω load from an +18 V supply. The CRD4412A can be powered from +8 V to +18 V. The CRD4412A is designed to operate in conjunction with the CRD4525. When connected, the combination implements a configuration with the CRD4412A operating in mono parallel full-bridge mode. The CRD4412A can also be operated without an attached CRD4525. In this configuration, all input/output connections are achieved through the CRD4412 interface header. The PWM audio power outputs are routed through an inductor/capacitor 2nd order low-pass filter LPF to re- move high-frequency components from the output signal, effectively converting it from digital to analog. ORDERING INFORMATION CRD4412A CS4412A Reference Design CRD4412 Interface Header Speaker Connector Mono Parallel Full-Bridge Right PWM Left PWM Stereo Full-Bridge Over Current Error Under Voltage/Temp Error Thermal Warning Power Reset CS4412A Output Filter Output Filter Copyright Cirrus Logic, Inc. 2007 All Rights Reserved MAY '07 DS786RD1 CRD4412A TABLE OF CONTENTS SYSTEM OVERVIEW 3 Power 3 CS4412A Digital Amplifier Power Stage 3 External Data Headers 3 Stereo/Mono Selection 3 Speaker Outputs 4 OPERATING INSTRUCTIONS 5 Operation with CRD4525 5 Stand-Alone Operation 5 GROUNDING AND POWER SUPPLY DECOUPLING 6 Power Supply Decoupling 6 Electromagnetic Interference EMI 6 Suppression of EMI at the Source 6 LIST OF FIGURES Figure Stereo Full-Bridge Speaker Terminal Configuration 4 Figure Mono Parallel Full-Bridge Speaker Terminal Configuration 4 Figure CS4412A - Schematic Page 1 8 Figure Power Outputs - Schematic Page 2 9 Figure Silkscreen Top 10 Figure Top-Side Copper Layer 11 Figure Inner Copper Layer 1 12 Figure Inner Copper Layer 2 13 Figure Bottom-Side Copper Layer 14 Figure Frequency Response in Parallel Full-Bridge Configuration 15 Figure THD+N vs Power in Parallel Full-Bridge Configuration 16 Figure THD+N vs Frequency in Parallel Full-Bridge Configuration 17 Figure FFT at -60dB Input in Parallel Full-Bridge Configuration 18 Figure FFT at 0dB Input in Parallel Full-Bridge Configuration 19 Figure Inter-Modulation Distortion of 19 kHz + 20 kHz in Parallel Full-Bridge Configuration 20 Figure Frequency Response in Stereo Full-Bridge Configuration 21 Figure THD+N vs Power in Stereo Full-Bridge Configuration 22 Figure THD+N vs Frequency in Stereo Full-Bridge Configuration 23 Figure FFT at -60dB Input in Stereo Full-Bridge Configuration 24 Figure FFT at 0dB Input in Stereo Full-Bridge Configuration 25 Figure Inter-Modulation Distortion of 19 kHz + 20 kHz in Stereo Full-Bridge Configuration 26 LIST OF TABLES Table System Connections 7 Table System Headers 7 Table CRD4412 Interface Header Signal Assignments 7 DS786RD1 CRD4412A SYSTEM OVERVIEW The CRD4412A reference design is an excellent means for evaluating the CS4412A 30 W digital amplifier power stage. The board is designed to connect directly to the CRD4525 digital amplifier reference design for easy evaluation. Alternatively, the CRD4412A may be used alone with all logic-level and power connections made through the CRD4412 interface header. The CRD4412A schematic set is shown in Figure 3 and Figure See the CRD4525 data sheet for more information about the features and connections of the CRD4525. Power Power VD, VP must be supplied to the evaluation board through the CRD4412 interface header J2 . All voltage inputs must be referenced to ground, also provided through the CRD4412 interface header. See the CRD4412 Interface Header Signal Assignments table on page 7 for signal-to-pin assignments. WARNING Please refer to the CS4412A data sheet for allowable voltage levels. CS4412A Digital Amplifier Power Stage The CS4412A is a 30 W quad half-bridge digital amplifier power stage. A complete description of the CS4412A is included in the CS4412A product data sheet. External Data Headers The evaluation board has been designed to allow interfacing with external systems via headers J2, J4, and J6. Figure 3 shows the headers’ electrical connections. The 20-pin, 2-column header, J2, is included to interface with the CRD4525 digital amplifier reference design and to interface with external sources when a CRD4525 is not connected. All necessary signals, power, and ground are presented on this header. See Figure 3 for complete connectivity information. The 4-pin, 2-column header, J4, provides access to the CS4412A’s thermal warning signal and the CS4525’s DLY_SDIN/EX_TWR signal. When a CRD4525 is attached, a shunt can be placed across these signals to deliver the CS4412A’s thermal warning signal to the CS4525’s external thermal warning input. Alternatively, this header can be used to connect the CS4412A’s thermal warning output to another device and to drive an external serial audio data source into the CS4525. A single ground column is provided to maintain signal integrity in this configuration. The 4-pin, 2-column header, J6, provides access to the CS4412A’s over-current error signals and the CS4525’s DLY_SDOUT signal. When a CRD4525 is attached, this header can be used to connect the CS4412A’s over-current error signals to another device and to connect the CS4525’s delay serial audio data output to an external device. A single ground column is provided to maintain signal integrity in this configuration. Stereo/Mono Selection

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CRD4412A
2 x 15 W CS4412A Digital Power Stage Reference Design

Pre-Configured for Stereo Full-Bridge Operation Delivers 15 W/Ch into 8 Ω at THD+N

Easily Configurable for Mono Parallel FullBridge Operation Delivers 30 W into 4 Ω at <10% THD+N

Directly Connects to CRD4525 Digital Amplifier Reference Design Implements a Configuration

Flexible I/O Provided PWM Logic Level Signal Inputs CS4412A Error and Warning Signals

Operates from +8 V to +18 V and V

Demonstrates Recommended Layout and Grounding Arrangements

Implements Recommended PWM Output Filtering

The CRD4412A demonstrates the CS4412A digital amplifier power stage. This reference design is preconfigured as a two-channel full-bridge power stage which delivers 15 W per channel into 8 Ω loads using a single +18 V supply. The design can be easily configured to operate as a single channel parallel full-bridge power stage capable of delivering 30 W into a 4 Ω load from an +18 V supply. The CRD4412A can be powered from +8 V to +18 V.

The CRD4412A is designed to operate in conjunction with the CRD4525. When connected, the combination implements a configuration with the CRD4412A operating in mono parallel full-bridge mode.

The CRD4412A can also be operated without an attached CRD4525. In this configuration, all input/output connections are achieved through the CRD4412 interface header.

The PWM audio power outputs are routed through an inductor/capacitor 2nd order low-pass filter LPF to re-
move high-frequency components from the output
signal, effectively converting it from digital to analog.
ORDERING INFORMATION

CRD4412A

CS4412A Reference Design

CRD4412 Interface Header Speaker Connector

Mono Parallel Full-Bridge Right PWM

Left PWM

Stereo Full-Bridge

Over Current Error Under Voltage/Temp Error

Thermal Warning

Power Reset

CS4412A

Output Filter

Output Filter

Copyright Cirrus Logic, Inc. 2007 All Rights Reserved

MAY '07 DS786RD1

CRD4412A

TABLE OF CONTENTS

SYSTEM OVERVIEW 3 Power 3 CS4412A Digital Amplifier Power Stage 3 External Data Headers 3 Stereo/Mono Selection 3 Speaker Outputs 4

OPERATING INSTRUCTIONS 5 Operation with CRD4525 5 Stand-Alone Operation 5

GROUNDING AND POWER SUPPLY DECOUPLING 6 Power Supply Decoupling 6 Electromagnetic Interference EMI 6 Suppression of EMI at the Source 6

LIST OF FIGURES

Figure Stereo Full-Bridge Speaker Terminal Configuration 4 Figure Mono Parallel Full-Bridge Speaker Terminal Configuration 4 Figure CS4412A - Schematic Page 1 8 Figure Power Outputs - Schematic Page 2 9 Figure Silkscreen Top 10 Figure Top-Side Copper Layer 11 Figure Inner Copper Layer 1 12 Figure Inner Copper Layer 2 13 Figure Bottom-Side Copper Layer 14 Figure Frequency Response in Parallel Full-Bridge Configuration 15 Figure THD+N vs Power in Parallel Full-Bridge Configuration 16 Figure THD+N vs Frequency in Parallel Full-Bridge Configuration 17 Figure FFT at -60dB Input in Parallel Full-Bridge Configuration 18 Figure FFT at 0dB Input in Parallel Full-Bridge Configuration 19 Figure Inter-Modulation Distortion of 19 kHz + 20 kHz in Parallel Full-Bridge Configuration 20 Figure Frequency Response in Stereo Full-Bridge Configuration 21 Figure THD+N vs Power in Stereo Full-Bridge Configuration 22 Figure THD+N vs Frequency in Stereo Full-Bridge Configuration 23 Figure FFT at -60dB Input in Stereo Full-Bridge Configuration 24 Figure FFT at 0dB Input in Stereo Full-Bridge Configuration 25 Figure Inter-Modulation Distortion of 19 kHz + 20 kHz in Stereo Full-Bridge Configuration 26

LIST OF TABLES

Table System Connections 7 Table System Headers 7 Table CRD4412 Interface Header Signal Assignments 7

DS786RD1

CRD4412A

SYSTEM OVERVIEW

The CRD4412A reference design is an excellent means for evaluating the CS4412A 30 W digital amplifier power stage. The board is designed to connect directly to the CRD4525 digital amplifier reference design for easy evaluation. Alternatively, the CRD4412A may be used alone with all logic-level and power connections made through the CRD4412 interface header.

The CRD4412A schematic set is shown in Figure 3 and Figure See the CRD4525 data sheet for more information about the features and connections of the CRD4525.

Power

Power VD, VP must be supplied to the evaluation board through the CRD4412 interface header J2 . All voltage inputs must be referenced to ground, also provided through the CRD4412 interface header.

See the CRD4412 Interface Header Signal Assignments table on page 7 for signal-to-pin assignments.

WARNING Please refer to the CS4412A data sheet for allowable voltage levels.

CS4412A Digital Amplifier Power Stage

The CS4412A is a 30 W quad half-bridge digital amplifier power stage. A complete description of the CS4412A is included in the CS4412A product data sheet.

External Data Headers

The evaluation board has been designed to allow interfacing with external systems via headers J2, J4, and J6. Figure 3 shows the headers’ electrical connections.

The 20-pin, 2-column header, J2, is included to interface with the CRD4525 digital amplifier reference design and to interface with external sources when a CRD4525 is not connected. All necessary signals, power, and ground are presented on this header. See Figure 3 for complete connectivity information.

The 4-pin, 2-column header, J4, provides access to the CS4412A’s thermal warning signal and the CS4525’s DLY_SDIN/EX_TWR signal. When a CRD4525 is attached, a shunt can be placed across these signals to deliver the CS4412A’s thermal warning signal to the CS4525’s external thermal warning input. Alternatively, this header can be used to connect the CS4412A’s thermal warning output to another device and to drive an external serial audio data source into the CS4525. A single ground column is provided to maintain signal integrity in this configuration.

The 4-pin, 2-column header, J6, provides access to the CS4412A’s over-current error signals and the CS4525’s DLY_SDOUT signal. When a CRD4525 is attached, this header can be used to connect the CS4412A’s over-current error signals to another device and to connect the CS4525’s delay serial audio data output to an external device. A single ground column is provided to maintain signal integrity in this configuration.

Stereo/Mono Selection

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Datasheet ID: CRD4412A 523137